Sewing-machine.



W. H. HUGG.

SEWING MACHINE.

APPLIOATION FILED M1143, 1909.

1,005,840', Patented Oct. 17, 1911.

WIT/VESSES i nvt/Emo); gfq q 'W css-'5C ATTORNEY coLuMnm pMNoGnAPn cq.. WASHINGTON. n, c.

narran sTnTns PATENT oFFi'oE.

WILLIAM I-I. HUGG, OF ELIZABETH, NEW JERSEY, ASSIGNOR'TO THE SINGER MANU'- FAGTUR-ING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Specification of Letters Patent.

Patented Oct. 17, 1911.

Application led January 13, 1909. Serial No. 471,996.

To all whom it may concern:

Be it known that I, WILLIAM H. HUGG, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Vlachines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates more particularly to an improvement in the mechanism forming the subject of my application Serial No. 439,298, filed June 19, 1908, and it has for its primary object to reduce the length of lower thread required in the production of stitches.

The invention relates to the construct-ion and arrangementof the constituent elements of the connection between the driving shaft and the looper-carrier whereby a dwell is imparted to the latter when in its forward position, thus shortening the length of travel of the looper and making it possible Vto correspondingly reduce the length of the looper-blade and proportionately reduce the length of looper thread handled in the stitching operation.

In the accompanying drawings, Figure 1 is a sectional front side elevation of a sewing machine embodying the present improvements, and Fig. 2 a transverse sectional elevation of the same through the upright portion of the bracket-arm, looking forwardly. vFig. 3 is a perspective view of the looper-actuating angle-lever, Fig. 4 a sectional elevation of the driving shaft and the y actuating eccentric thereon with the loopercarrier and the yoke embracing said eccentric, and Fig. 5 is a perspective view of the looper-thread controller.

The present machine is constructed with the usual base 1 and bracket-arm comprising Vthe hollow upright portion 2 and overhanging member 3 in the head 4 of which is journaled the vertically reciprocating needlebar 5, provided in the'present instance with the twin-needle clamp 6 carrying the diagonally arranged eye-pointed needles 7.

The longitudinally arranged main or driving shaft 8 is journaled in suitable bearings in the base l beneath the work-plate 10 and is provided near its rearward end with an actuating crank 9 and in practice receives its .its rearward end.

motion from the usual pulley mounted upon tudinally of the overhanging bracket-arm and carries at its forward end a crank-arm 12 having a pin connected by means of the usual link 13 with a rearwardly projecting stud carried by the collar 14 liXed upon the needle-bar 5, from which connections the needles receive their operative movements from the rock-shaft 11.

The needle-actuating rock-shaft 11 has fixed upon its rearward end a rocking member 15 with angularly arranged crank-arms 16 and 17, the former of which is provided with a stud-screw 18 embraced by the upper end of a pitman-rod 19 whose opposite end embraces the crank 9 of the driving shaft 8 from which the rock-shaft 11 derives its operative movements. The second crankarm 17 of the rocking'member 15 carries a ball-crank-pin 20 embraced by the upper end of a pitman 21 whose lower end embraces a ball-crank-pin 22 carried by the rearwardly extending arm 23 of an angle-lever whose hub 24 is fitted upon the fulcrum-pin 25 mounted in the bearing boss 25X in the base 1 transversely of the driving shaft, the upwardly extending arm 26 of the angle-lever carrying a ball-crank pin 27 embraced by the rearward end of a pitman 28 whose for ward end embraces a ball-crank pin 29 laterally projecting from the looper-carrier 30.

The looper-carrier 30 is provided with sockets 31 in which are secured by means of fastening screws 32 the shanks of the threadcarrying loopers 33 whose blades are disposed in planes substantially parallel with the direction of reciprocation of the pitman 28 and are adapted each to coperate with its respective needle 7 in the production of parallel double chain-stitch seams. The looper carrier 30 is iiXed upon a fulcrumstud 34 journaled in the lateral bearing boss 35 of an arm 36 having a hub 37 fixed upon the longitudinal rock-shaft 38 and having secured upon its hub the split collar 39 clamped thereon by means of the screw 40 having an upright arm 41 forked to embrace a wearing block 42 fitted upon an eccentric 43 upon the forward end of the driving shaft 8.

As will be observed, the needle-actuating shaft 11 derives its rocking movements from the main or driving shaft 8 through the pitman connection 19 with the lateral crankarm 16, thus communicating to the needles their reciprocating movements; while the second crank-arm 17 of the angle-lever 15 is connected with the looper-carrier through the pitman 21, angle-lever 23 26 and pitman 28 for imparting to-and-fro loop-seizing and loop-shedding movements in planes substantially parallel with the shafts 8 and 11 in the production of stitches.

By reference to Fig. 2, it will be observed that when the actuating crank 9 is in its upper position the crank-arm 16 of the rocker 15 will assume its corresponding upper position laterally of the rock-shaft 11, as represented in full lines in said figure, but when the driving shaft has made a semirotation, so as to bring the arm 16 into itsJ lower or dotted line position of said figure, the other arm of the rocker 15 will have asj sumed the position represented in dotted lines above the axis of the needle-actuatingl rock-shaft and in substantial alinement with the same and the ball-crank-pin 22 at thef lower end of the pitman 21. It will thus be observed that in one of the eXtreme posi-I tions of the rocker 15, which corresponds, with the lower position of the needles andfl retracted positions of the loopers, the pit-y man 21 follows closely the movements of; the pitman 19, the reversal of reciprocatory movement of the needles and loopers in such Q position being substantially the same. In

the other eXtreme position of the needles and loopers, however, the lag of the pitman y 21 in relation to the pitman 19 causes a dwell of the loopers in their advance or loop-presenting positions to enable the needles to descend within the looper loops bej fore the loopers are too far retracted to permit such operation.

The loopers derive their sidewise or needle-avoiding movements directly from the eccentric 43 upon the driving shaft through the rocking arms 36 and 41, the latter carrying the transversely disposed fulcrumstud 34 which, although having a slight endwise movement upon the rock-shaft 38, is maintained practically at a fixed distance beneath the work-plate, so that the path of movement of the loop-taker in its seizing and shedding movements is wholly beneath the work.

Upon the base 1 is secured by means of screws 44 the foot 45 of an upright post 46 to which is adjustably secured by means of the fastening screw 47 passing through a transverse slot 48, the foot 49 of a threadguiding member with spaced upturned lips 50 each provided with -an open thread-guiding eye 51. Adjacent the post 46 the mainshaft is provided with a triangular cam 52 with oppositely arranged concentric portions and intermediate active or eccentric portions, such cam being embraced by the parallel members of a yoke 53 pivotally mounted upon the fulcrum-stud 54 carried by the foot 45 of the post 46 and having its parallel members connected by a bridge piece 55 upon which is secured by a fastening screw 56 the wire guide-finger 57 formed with an open guide-eye 58. The guide-eye 58 is so disposed that under the action of the cam 52 it assumes a position alternately intermediate and in alinement with the guide eyes 51 and in advance of said guide eyes, its alined relation with the stationary guide-eyes 51 being maintained while the loopers are in their forward or advanced positions, and its retracted position being assumed at the time the loopers are retracted. The looper-thread is slaclened while the loopers are advancing to seize the needle-thread loops, and is drawn up to prevent the entanglement of the looper threads with the needles while the loopers are moving into retracted position. Adjacent the thread-controller cam 52 the main-shaft carries a nipper-.actuating eccentric 59 embraced by the strap 60 of the eccentric-rod 61 whose opposite end is pivotally connected by means of the screw-pin 62 with a vibrating nipper-lever 63 fulcrumed upon the screw-pin 64 tapped into the base of the post 46. The lever 63 carries at its upper end the contact screw 65 whose point is adapted to engage the upper or free end of the adjacent member of a pair of nippersprings 66 and 67 secured to the lower portion of the post 46 by means of the fastening screw 68. The spring 67 is of such form that itis practically out of the range of action of the lever 63, and affords a normally stationary thread-nipping jaw at one side of the rearward thread-guiding member 51, while the other nipper-spring 66 is so formed that the thread-nipping jaw afforded by its upper end is normally spaced from the stationary jaw, but is thrust tcward the same to nip the looper threads during the formation of each stitch by the engagement with such nipper-spring of the contact-screw 65 carried by the lever 63. The eccentric 59 is so timed in relation to the cam 52 that the nipper remains open while the looper-thread controller is giving up slack during the advance of the loopers, but closes upon the thread preparatory to the thread-tightening action of the threadcontroller. By wholly releasing the looper threads as the loopers attain their advanced positions for seizing the needle loops, suiiicient looper-thread is pulled through the open nipper for the stitch, the subsequent closing of the nipper upon the thread permitting the thread-controller to maintain the thread taut during the retraction of the looper and setting of the stitch by the usual needle-thread take -up member without drawing superfluous looper-thread. By this means the usual looper-thread tension device is dispensed with.

The machine may be provided with any usual or suitable feeding mechanism, and is herein shown comprising an actuating eccentric 69 upon the driving shaft embraced by the strap 70 of an eccentric-rod in practice connected with the usual feed-rocker from which the feed-dog 71 derives its to-and-fro feeding movements transversely of the driving shaft of the machine bed.

lhile the present improvement is herein shown and described in its preferable form, it is evident that the same is susceptible of modification in the form and arrangement of its component parts without departure from the invention.

Having thus set forth the nature of the invention, what I claim herein is l. In a sewing machine, the combination with the work-plate and a driving shaft mounted beneath the same, of a reciprocating needle, a cooperating oscillatory looptaker, a fulcrum for said loop-taker disposed transversely to the driving` shaft and maintained at a substantially fiXed distance below the work-plate, a needle-actuating rock-shaft parallel with the driving shaft, an operative connection between said rockshaft and the needle, a crank-arm upon said rock-shaft, a connection between said crankarm and the loop-taker, including a pitman pivotally attached at one end to said crank-arm, and an operative connection intermediate the driving shaft and said rockshaft for imparting to the latter rocking movements wherein the reversal at one eX- tremity of its range of movement occurs while the pivotal connection of said pitman with the crank-arm is substantially in alinev ment with the axis of motion 0f said rockshaft and the opposite end of said pitman.

2. In a sewing machine, the combination with the work-plate and a driving shaft mounted beneath the same, of a reciprocating needle, a cooperating oscillatory looptaker, a fulcrum upon which said looptaker is mounted disposed transversely to the driving shaft and maintained at a substantially fixed distance below the workplate, a needle-actuating rock-shaft parallel with said main-shaft, an operative connection between said rock-shaft and the needle, a plurality of angularly disposed crankarms upon said rock-shaft, a connection intermediate one of said crank-arms and the loop-taker, including Va pitman pivotally attached at one end to said crank-arm, and an operative connection, including a pitman, intermediate said driving shaft and the other of said crank-arms of the rock-shaft and adapted to move the pitman connection with the first-named crank-arm into and out of alinement with the aXis of motion of the rock-shaft and the opposite end of the firstnamed pitman.

3. In a sewing machine, the combination with the work-plate and a rotary driving shaft mounted beneath the same and provided with an actuating crank, of a reciprocating needle, a cooperating oscillatory loop-taker, a fulcrum for said loop-taker disposed transversely to said driving shaft and maintained at a substantially fixed distance below the work-plate, a needle-actuating rock-shaft parallel with the mainshaft, an operative connection between said rock-shaft and the needle, a plurality of angularly disposed crank-arms upon said rock-shaft, a connection intermediateV one of said crank-armsV and the loop-taker, including a pitman pivotally attached at one end to said crank-arm and a bell-crank lever mounted for movement in a vertical plane parallel with the main-shaft upon a fulcrum transverse to the latter and having angularly disposed arms connected respectively to the opposite end of said pitman and to said loop-taker, and an operative connection, including a pitman, intermediate the actuating crank of said driving shaft and the other of said crank-arms of the rock-shaft and adapted to move the pitman-connection with the first-named crank-arm into and out of substantial alinement with the axis of motion of the rockshaft and the opposite end of the first'- named pitman while the actuating crank is in substantial alinement withv the axis of the driving shaft and the point of connection between the second-named intermediate pitman and its respective crank-arm of the rock-shaft.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

WILLIAM H. HUGG.

Witnesses VICTOR E. SMITH, JOSEPH F. JAQUITH.

Copies 0f this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 13.1%.V Y 

